Brake shoe



Oct. 18, 1932, R B; PQGUE 1,882,884

BRAKE SHOE Filed Feb. 14, 1931 Patented Oct. 18, 1932 UNITED STATESPATENT OFFICE ROBERT B. POGUE, OF CHICAGO, ILLINOIS, ASSIGNOR TO THEAMERICAN BRAKE SHOE & FOUNDRY COMPANY, OF WILMINGTON, DELAWARE, ACORPORATION OF DELARARE BRAKE SHOE .lpplieatien filed February 14, 1931.Serial No. 515,654.

This invention relates to brake shoes of the kind which are oftenreferred to as composition shoes or filled shoes and comprise a metalshell containing a friction composition body. The body is held in placeby the sides and ends of the shell which are sometimes provided withopenings to receive the body mate rial for anchoring the body in theshell. The pressure and friction heat in service applications of thebrake shoe in the ordinary use thereof sometimes cause the sides of theshell to bulge or otherwise become distorted so that the body will nolonger be rigidly and securely held in the shell and when this happensthe body is liable to break down and fall away.

It is the object of my invention to more seeurely hold the body in theshell by reenforcing and strengthening the shell so that it willmaintain its shape throughout the period of use of the shoe.

Another object of the invention is to maintain the sides of the shell inparallelism during the period of use of the shoe by means of transversebraces which are so arranged and disposed that they will not weaken thebody.

And a further object of the invention is to provide a novel constructionof the shell to assist in the formation of the end and guide lugs and toreenforce and strengthen the same.

I11 the accompanying drawing I have illustrated the invention in aselected embodiment and referring thereto,

F ig. 1 is a longitudinal central section view of a brake shoe embodyingthe invention.

Fig. 2 is a plan view showing the back of the shell.

Fig. 3 is a plan view showing the inside of the shell.

Fig. I is a detail sectional view on the line H of Fig. 2.

Fig. 5 is a transverse sectional view on the line 5-5 of Fig. 2.

Fig. 6 is a transverse sectional view of a flanged shoe embodying theinvention.

Referring to the drawing, the shell is stamped out of sheet metal andcomprises a back 7, sides 8, 8 and ends 9, 9. The back of the shell ispreferably provided with corrugations or flutes 10 extending lengthwiseof the back to increase the stiffness and rigidity thereof.

The sides of the shell are provided with openings 11 to receive the bodymaterial 12 for anchoring the body'in the shell. The ends 9 of the shellmay likewise be provided with openings 11 if desired. The edges 13 ofthe sides of the shell may be scalloped as shown in Fig. 4 if desired.Cross braces 14 are arranged within the shell and the ends 15 of thebraces are bent to lie snugly within and against the sides of the shellto which they are rigidly secured by spot-welding or other suitablemeans. The shell is arcuate and the braces are narrow metal stripsextending transversely in a direction generally radial of the arc of theshell. The ends of the braces may be enlarged to form ample bearingagainst the sides of the shell and to accommodate whatever securingmeans may be employed. Any number of these braces may be provided asshall be found necessary or desirable; and when two are employed Iprefer to' arrange them substantially midway between the attaching lug16 and the ends of the shell. The braces for an unflanged shoe, as shownin Figs. 15, are preferably abutted against the corrugations or flutes10 which space the braces away from the back of the shell, Fig. 5. Itisnotnecessarythatthebraces should be fastened except at their ends tothe shell, Figs. 1-5, but in the flanged type of shoe as shown in Fig.6, it is desirable to fasten the braces between their ends to the shellas well as at their ends, and referring to Fig. 6 I have shown the brace17 provided with the enlarged ends 18 which are fastened to the shell ashereinbefore explained, and also with lugs 19 which are spot-welded orotherwise fastened to the shell opposite the tread of the shoe and inthe flange of the shell. These ad ditional fastening means ensuremaintaining the brace inrigid position while the body material is beingpressed into the shell and during the subsequent service use of theshoe. A transverse slot 20 is cut in the back adjacent each end of theshoe and the metal stamped out in forming this slot is pressed up toform the high inner flanges 21 and the low outer flange 22, the innerflanges being spaced apart at 23. Flanges 24 extending lengthwise of theshell are stamped fromthe back thereof to form an opening 25 whichcommunicates through the space 23 with the slot 20. The flanges 24L abutthe flanges 21 and the body material is permitted to flow up through theslot 20 and the opening 25 to form the end lug 26 and the side lug 27whichv are in-. tegrally connected by the body material in the space 23.Thus the end lug is faced on its inner side by the flanges 21 and theguide lug is faced on its sides by the flanges 24, these flanges formingwear surfaces to receive'the brake head to which the shoe is applied.The provision of the slots 20 and openings 23 and 25 to permit the bodymaterial to flow and seat therein and form the end and guide lugs,provides an additional anchorage for the'body in the shell and thecomposition material of these lugs serves to support and reenforce thewear and facing flanges 21 and 24. The upturned flange 22 at the outeredge of the end service which naturally have a tendency to loosen thebody in the shell and break down the body and cause it to disintegrateor fall away from the shell. The transverse braces help to resist thestrainsof brake-applications on the body besides'holding the sides ofthe body rigidly in position while the body is being pressed into theshell and during subse-. quent use of the shoe.

I have described the shell as made of sheet metal and the body-as madeof a friction composition but I do not restrict the invention to thesematerials or to the particular construc tion and arrangement of partsand reserve the right to make any changes therein within the scope ofthe following claims:

I claim:

1. A brake shoe comprising a shell and transverse braces secured Withinthe shell and spaced from the back thereof.

2. A brake shoe comprisinga shell having. longitudinally extendingcorrugations in the back thereof, and transverse braces secured withinthe shell and abutting said corrugations.

3. A brake shoe comprising a shell and a body secured therein, saidshell having a transverse slot and an opening connected therewith toreceive body material for forming the end and guide lugs, and flangesstruck up from the back of the shell and forming wear facings for saidlugs to engage a brake head.

4. A brake shoe comprising a shell and a body secured therein, saidshell having a transverse slot adjacent an end thereof to receive bodymaterial for forming the end lug, a flange at the inner edge of saidslot forming a wear facing for the end lug to engage a brake head, theouter edge of the slot being iturned up to form a flange tosupport theend 5. A brake shoe comprising a shell, a composition body moldedtherein, and transverse braces connecting the sides of the shell andembedded in the body of the shoe spaced from the wearing face thereof. I

6. A brake shoe comprising a shell, a composition body molded therein,and transverse braces connecting the sides of the shell and embedded inthe body of the shoe spaced from the wearing face and adjacent the backthereof.

7. A brake shoe comprisinga shell, a composition body molded therein,and transverse braces connecting the sides of the shell and embedded inthe body of the shoe spaced from the Wearing face and the back thereof.

8. A brake shoe comprising a shell, a composition body molded therein,and transverse braces embedded in the body and having bent endsextending longitudinally of the shoe and abutting the sides of the shelland rigidly;

secured thereto.

9. brake shoe comprising a shell, a composition body molded therein, andtransverse braces embedded in the body spaced from the wearing facethereof and having enlarged ends extending toward the wearing face ofthe shoe and abutting the sides of the shell and rigidly securedthereto.

ROBERT B. POGUE.

